CN114459998A - Method and tool for testing shearing bonding strength of colloid - Google Patents
Method and tool for testing shearing bonding strength of colloid Download PDFInfo
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- CN114459998A CN114459998A CN202210248991.XA CN202210248991A CN114459998A CN 114459998 A CN114459998 A CN 114459998A CN 202210248991 A CN202210248991 A CN 202210248991A CN 114459998 A CN114459998 A CN 114459998A
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- 239000000084 colloidal system Substances 0.000 title claims abstract description 96
- 238000012360 testing method Methods 0.000 title claims abstract description 73
- 238000010008 shearing Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000853 adhesive Substances 0.000 claims abstract description 44
- 230000001070 adhesive effect Effects 0.000 claims abstract description 44
- 230000005540 biological transmission Effects 0.000 claims description 16
- 238000009864 tensile test Methods 0.000 claims description 10
- 210000000078 claw Anatomy 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 238000013459 approach Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 4
- 235000012431 wafers Nutrition 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 description 22
- 230000007704 transition Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 6
- 239000003292 glue Substances 0.000 description 6
- 230000013011 mating Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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Abstract
The invention relates to the technical field of adhesive force testing and machinery, in particular to a method and a tool for testing the shearing and bonding strength of a colloid. The first aspect provides a method for testing the shear bonding strength of a colloid, which comprises the steps of applying positive pressure to a sample, fixing an outer bonding sheet, pulling a core bonding sheet to move outwards through a tensile force tester until the core bonding sheet is completely separated from the colloid on any one side, recording the maximum load during shearing as a breaking load, and calculating the shear bonding strength of the colloid according to the breaking load; applying different positive pressures to the same colloid under the condition of the same bonding area to obtain the shearing bonding strength of the colloid under different positive pressures; and respectively testing the shearing bonding strength of different colloids under different positive pressures. The method can test the adhesive force of the film more accurately and efficiently, so that a proper colloid with the preset splicing adhesive strength under the preset positive pressure is selected.
Description
Technical Field
The invention relates to the technical field of adhesive force testing and machinery, in particular to a method and a tool for testing the shearing and bonding strength of a colloid.
Background
In the prior art, when the film is used for a power system, the film has a certain thickness, and when the adhesive force is tested, the test result is often influenced by material creep or other deformation, and the detection result obtained by the commercial shear adhesive strength detection method has partial deviation. Particularly, when a part of materials are detected, the material sample can be partially peeled, the influence on the final obtained result of the shearing bonding strength is different, and the true value of the material bonding force or the material gum bonding force cannot be obtained;
and at the present stage, only the static state of the material can be tested, the shearing bonding strength of the material under the actual use condition cannot be simulated, and the strength of the material under the corresponding pressure cannot be visually seen in the actual selection of the material.
Disclosure of Invention
The invention provides a method and a tool for testing the shearing bonding strength of a colloid, which can test the bonding strength of the colloid more accurately and efficiently so as to select a proper colloid with preset splicing bonding strength under a preset positive pressure.
Embodiments of the invention may be implemented as follows:
the first aspect provides a method for testing the shear bonding strength of a colloid, which comprises the following steps:
applying a positive pressure to a sample comprising a core adhesive wafer and two outer adhesive wafers; the two outer side bonding sheets are respectively arranged on two sides of the bottom of the core bonding sheet; the core bonding sheet and the outer side bonding sheet are bonded and connected through a colloid; positive pressure is applied perpendicularly to the outer adhesive sheet; fixing the outer side bonding sheet, pulling the core bonding sheet to move outwards through a tensile force tester until the core bonding sheet is completely separated from the colloid on any side, recording the maximum load during shearing as a breaking load, and calculating the shearing bonding strength of the colloid according to the breaking load;
applying different positive pressures to the same colloid under the condition of the same bonding area to obtain the shearing bonding strength of the colloid under different positive pressures;
respectively testing the shear bonding strength of different colloids under different positive pressures;
and selecting the colloid meeting the shearing preset bonding strength under the preset positive pressure according to the plurality of groups of measurement results.
The method for testing the splicing bonding strength of the colloid is characterized in that positive pressure is applied to a bonding sample at the outer side, and the colloid boundary is prevented from being separated in advance in the testing process, so that the adhesive force of the colloid can be accurately and efficiently measured. According to the test method, positive pressure is applied to the bonding sample on the outer side, and the bonding condition under the actual use scene is simulated along with the change of the positive pressure, so that multiple groups of data are tested, and the selection of the colloid with corresponding shearing bonding strength under different actual use conditions is facilitated.
As an alternative embodiment, two outer adhesive sheets are symmetrically disposed on both sides of the core adhesive sheet in a thickness direction of the core adhesive sheet, respectively;
and the tops of the outer side bonding sheets are arranged at the bottoms of the core bonding sheets through the glue.
As an alternative embodiment, a positive pressure F is applied to the outside of the outer adhesive sheet; the positive pressure F is increased progressively from 0kg by a preset pressure value, and at least 10 groups of data are obtained through testing; when the positive pressure is too large, the tensile testing machine cannot pull the test sample, and the positive pressure needs to be reduced for retesting.
As an alternative embodiment, the core adhesive sheet and the outer adhesive sheet are both made of the same material;
and/or the thickness of the core bonding sheet is the same as that of the outer side bonding sheet;
and/or the moving direction of the core bonding sheet relative to the outer side bonding sheet is always parallel to the bonding plane of the colloid, and no offset is generated;
and/or, the experimental results use the formula σcCalculated as P/A, where σcThe bonding shear strength of the bonding plane is expressed in MPa; p is the damage load when the bonding surface is damaged, and the unit is N; a is the sum of the areas of the bonding surfaces and the unit is mm2。
The second aspect provides a colloid shear bonding strength test fixture, and it includes:
a clamping part and a clamping jaw moving assembly;
the clamping part comprises a clamping jaw base and a movable clamping jaw, and the clamping jaw base and the movable clamping jaw enclose to form a clamping space for clamping a sample;
the clamping jaw moving assembly is arranged on the clamping part, so that the movable clamping jaw and the clamping jaw base are close to each other along a first direction to apply positive pressure to the sample.
The tool can improve the condition that the side boundary of the colloid possibly partially breaks away from the adhesion during the adhesion force test in the prior art, thereby avoiding the condition that the part breaks away from the adhesion and the shearing adhesion strength is partially converted into stripping, and the measured result is slightly smaller than the actual result. Meanwhile, the tool is beneficial to simulating the shearing bonding strength of the material under the actual use condition, so that the strength of the material under corresponding pressure can be visually seen in the actual selection of the material.
As an alternative embodiment, the jaw base comprises a first jaw part and a base body, and one side of the first jaw part, which is close to the movable jaw, is provided with a first jaw fixing surface;
the movable clamping jaw comprises a second clamping jaw part, and the second clamping jaw part is provided with a second clamping jaw fixing surface which is arranged opposite to the first clamping jaw fixing surface; the first clamping jaw fixing surface and the second clamping jaw fixing surface enclose to form the clamping space;
the movable clamping jaw is movably arranged on the base body, so that the first clamping jaw fixing surface and the second clamping jaw fixing surface are close to each other to apply positive pressure to the sample.
As an alternative embodiment, the movable clamping jaw comprises a movable part, and the base body comprises a limiting part;
the limiting part is matched with the movable part so that the first clamping jaw part and the second clamping jaw part are kept relatively close to or far away from each other to apply positive pressure to the sample;
as an alternative embodiment, the first jaw fixing surface is a knurled surface;
as an alternative embodiment, the second jaw fixing surface is a knurled surface;
as an alternative embodiment, the second clamping jaw part and the movable part are in transitional connection through an inclined plane;
as an alternative embodiment, along the first direction, the movable part is embedded in the limiting part;
as an optional implementation manner, the limiting part is a limiting groove extending along the first direction, and the movable part is a protruding part arranged at the bottom of the second clamping jaw part;
as an optional implementation mode, the limiting groove is a dovetail groove, and the movable part is a dovetail-shaped protrusion;
as an alternative embodiment, the thickness of the movable portion is greater than the thickness of the second jaw portion in the first direction.
As an alternative embodiment, the jaw moving assembly comprises a transmission rod;
the transmission rod comprises a matching section and a thread section provided with an external thread; the clamping jaw base is provided with a fixing hole, and the movable clamping jaw is provided with a transmission threaded hole; the matching section is rotatably arranged in the fixing hole, and the thread section is matched with the internal thread in the transmission threaded hole so as to drive the movable clamping jaw to be close to or far away from the clamping jaw base;
as an optional implementation manner, the clamping jaw moving assembly further comprises a fixing flange, the fixing flange is arranged on the periphery of the fixing hole, and the fixing flange and the fixing hole enclose a space for accommodating the rotation of the matching section;
as an alternative embodiment, the transmission rod further comprises a connecting section and an extending section, and the jaw moving assembly further comprises a rotating rod; the thread section is connected with the matching section through a connecting section, and the extending section is arranged at the end part of the matching section far away from the connecting section; the rotating rod is arranged in the circumferential direction of the extending section.
As an optional implementation mode, the colloid shear bonding strength test tool further comprises a tool fixing and adjusting part; the fixed adjusting part of frock movably sets up the bottom of clamping part to make the focus of sample with tensile testing machine's tensile direction, the extending direction of sample are located the coplanar.
As an optional implementation mode, the tool fixing and adjusting part comprises a sliding bottom fixing component and a locking component;
the sliding bottom is movably arranged on the clamping jaw base, and the locking assembly is fixedly connected with the sliding bottom so as to lock the sliding bottom on the clamping jaw base;
as an alternative embodiment, the locking assembly includes a sliding rod and a fastener; the clamping jaw base is provided with a waist-shaped hole, the waist-shaped hole extends along a first direction, and the sliding rod penetrates through the waist-shaped hole; the sliding bottom fixing is movably arranged on the clamping jaw base through a sliding rod, and the fastening piece is connected with the sliding rod so as to lock the sliding bottom fixing on the clamping jaw base;
as an alternative embodiment, the fastener is in threaded connection with the sliding rod;
as an optional embodiment, the sliding bottom fixing comprises an upper sliding part and a lower fixing part; the bottom of the clamping jaw base is provided with a sliding groove extending along a first direction, and the upper sliding part is movably arranged in the sliding groove;
in an alternative embodiment, the upper sliding part is a dovetail protrusion, and the sliding groove is a dovetail groove.
As an optional implementation mode, the colloid shearing and bonding strength testing tool further comprises a pressure sensor, wherein a mounting groove and a wiring harness groove are formed in the clamping jaw base, and an accommodating through hole facing the movable clamping jaw is formed in the bottom of the mounting groove; the pressure sensor is arranged in the mounting groove, a data line of the pressure sensor is arranged in the wiring harness groove, and the accommodating through hole is used for accommodating the detection head of the pressure sensor.
The beneficial effects of the embodiment of the invention include, for example:
the method and the tool for testing the shearing and bonding strength of the colloid apply positive pressure to a sample through the tool during testing, the clamping part fixes the outside experiment bonding sheet, the core bonding sheet is pulled through the tensile force experiment machine to move outwards until the core bonding sheet is completely separated from the colloid on any side, and the maximum load during shearing is recorded as the breaking load. On one hand, the situation that the actual value of the material bonding force or the material gum bonding force cannot be obtained due to the fact that the material sample can be partially peeled off and the final obtained result of the shearing bonding strength is influenced in different degrees through the continuous positive pressure in the prior art can be avoided; on the other hand, the shear bonding strength of the simulated colloid material under the actual use condition can be obtained by adjusting the continuous positive pressure, so that the colloid which meets the preset shear bonding strength can be selected conveniently; the strength of the material under the corresponding pressure can also be visually seen.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural diagram of a sample according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a colloid shear bonding strength test fixture according to an embodiment of the present invention;
FIG. 3 is an assembly diagram of the colloid shear bonding strength test fixture according to the embodiment of the invention;
FIG. 4 is an assembly diagram of another view of the adhesive shear adhesion strength testing tool according to the embodiment of the invention;
fig. 5 is a cross-sectional view of a colloid shear bonding strength test fixture in an embodiment of the invention.
Icon: 10-sample; 11-core bonding sheet; 12-an outer adhesive sheet; 13-colloid; 20-a colloid shear bonding strength testing tool; 21-clamping part; 100-a jaw base; 101-a fixation hole; 102-a mounting groove; 103-wire harness slot; 104-a receiving through hole; 110-a first jaw portion; 111-a first jaw securing face; 120-a substrate; 121-a first sliding plane; 122-a limiting part; 123-kidney shaped hole; 124-a sliding groove; 200-a movable jaw; 201-driving threaded holes; 210-a second jaw portion; 211-a second jaw securing surface; 212-a second sliding plane; 220-a movable part; 222-a transition portion; 23-a jaw moving assembly; 310-a transmission rod; 311-a threaded segment; 312-a connecting segment; 313-a mating segment; 314-an extension; 320-a fixed flange; 330-rotating rod; 24-a tool fixing and adjusting part; 410-slipping bottom fixing; 411-upper glide; 411 a-mating through hole; 412-lower fixation; 413-a transition junction; 420-a slide bar; 430-a fastener; 25-pressure sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Fig. 1 is a schematic structural diagram of a sample of the present embodiment, fig. 2 is a schematic structural diagram of a colloid shear adhesion strength testing tool of the present embodiment, fig. 3 is an assembly drawing of the colloid shear adhesion strength testing tool of the present embodiment, fig. 4 is an assembly drawing of the colloid shear adhesion strength testing tool of another view angle of the present embodiment, and fig. 5 is a cross-sectional view of the colloid shear adhesion strength testing tool of the present embodiment.
Referring to fig. 1, the present example provides a sample 10, the sample 10 includes a core adhesive sheet 11 and two outer adhesive sheets 12; two outer adhesive sheets 12 are respectively disposed at both sides of the bottom of the core adhesive sheet 11; the core adhesive sheet 11 and the outer adhesive sheet 12 are bonded and connected by a glue 13.
In the present embodiment, the core adhesive sheet 11 and the outer adhesive sheet 12 are made of the same material. Optionally, the material may be an aluminum alloy material, a stone material or other metal materials, a non-metal material, a composite material, or the like, and the specific selection is determined by the actual use scenario of the colloid 13.
Further, the core adhesive sheet 11 and the outer adhesive sheet 12 are both plate-shaped rectangular sheets having the same thickness and the same shape and size.
Further, along the thickness direction of the core bonding sheets 11, two outer bonding sheets 12 are respectively and symmetrically arranged on two sides of the core bonding sheets 11; and the top of the outer adhesive sheets 12 are all disposed at the bottom of the core adhesive sheet 11 through the glue 13. Compared with the case that the plate surface of the outer adhesive sheet 12 is completely adhered to the core adhesive sheet 11, the arrangement mode can reduce the coating area of the adhesive 13 under the condition of ensuring the shearing adhesive strength of the adhesive 13, the adhesive force of the whole sample 10 is reduced, the working time of the tensile testing machine is correspondingly reduced, the testing efficiency is improved, and the cost is saved.
In this embodiment, the core bonding sheets 11 need to be coated with glue on both sides, and then the outer bonding sheets 12 respectively press the core bonding sheets 11, and glue 13 is arranged between the core bonding sheets 11 and the outer bonding sheets 12; after the connection is completed, the sample 10 is prepared successfully after the colloid 13 is completely connected (that is, the colloid 13 is completely solidified or meets the actual working state).
Referring to fig. 2, fig. 3, fig. 4 and fig. 5, the present embodiment provides a tool for testing the adhesive shear bonding strength of the sample 10. The colloid shearing and bonding strength testing tool 20 comprises a clamping part 21 and a clamping jaw moving assembly 23; the clamping part 21 comprises a clamping jaw base 100 and a movable clamping jaw 200, and the clamping jaw base 100 and the movable clamping jaw 200 enclose to form a clamping space for clamping the sample 10;
the jaw moving assembly 23 is provided on the clamping portion 21 so that the movable jaw 200 and the jaw base 100 approach each other in the first direction to apply a positive pressure to the sample 10.
Further, the jaw base 100 includes a first jaw portion 110 and a base 120, and a first jaw fixing surface 111 is provided on a side of the first jaw portion 110 close to the movable jaw 200. Specifically, the first jaw portion 110 and the base 120 are formed in an "L" shape as a whole, and the first jaw fixing surface 111 is provided to protrude from the first jaw portion 110 toward the movable jaw 200.
The movable jaw 200 includes a second jaw portion 210, the second jaw portion 210 having a second jaw fixing face 211 disposed opposite to the first jaw fixing face 111; the first clamping jaw fixing surface 111 and the second clamping jaw fixing surface 211 enclose to form a clamping space; the movable jaw 200 is movably disposed on the base 120 such that the first jaw fixing surface 111 and the second jaw fixing surface 211 approach each other to apply a positive pressure to the sample 10. Specifically, the second jaw fixing face 211 is provided projecting on the second jaw portion 210 on a side toward the first jaw portion 110.
As can also be seen from fig. 2 to 5, the first jaw portion 110, the base 120 has a long hair shape. Specifically, the first claw portion 110 is provided perpendicularly to the end portion in the longitudinal direction of the base 120. The upper surface of the base 120 forms a first sliding plane 121, and the bottom of the second jaw 210 has a second sliding plane 212. The second sliding plane 212 is slidably engaged with the first sliding plane 121 in the first direction, and when the first sliding plane 121 and the second sliding plane 212 are slidably engaged, the first claw portion 110 and the second claw portion 210 are kept flush. Specifically, the first jaw fixing surface 111 and the second jaw fixing surface 211 are kept flush in the height direction of the base 120; the first jaw fixing surface 111 and the second jaw fixing surface 211 are always disposed parallel to and opposite to each other along the longitudinal direction of the base 120. This allows the jaw base 100 and movable jaw 200 to provide a continuous, steady positive pressure driven by the jaw moving assembly 23.
The first jaw fixing surface 111 and the second jaw fixing surface 211 are knurled surfaces, so that friction force can be increased, and the sample 10 can be prevented from slipping during clamping.
As shown in fig. 2 to 5, the tool is further provided with a pressure sensor 25. The clamping jaw base 100 is provided with a mounting groove and a wiring harness groove, the bottom of the mounting groove is provided with a containing through hole facing the movable clamping jaw 200, and the containing through hole is used for containing a detection head of a pressure sensor. The pressure sensor 25 is disposed in the mounting groove, and the data line of the pressure sensor 25 is disposed in the harness groove.
Specifically, one side of the first clamping jaw part 110, which is far away from the movable clamping jaw 200, is provided with a mounting groove 102, so that the pressure sensor 25 can be completely embedded, and the side wall of one side of the mounting groove 102 is provided with a wire harness groove 103 for accommodating a wire harness of the pressure sensor 25. The arrangement of the mounting groove 102 and the accommodating through hole 104 is to ensure that the detection head of the pressure sensor 25 slightly protrudes out of the first clamping jaw fixing surface 111 after assembly, so that excessive protrusion cannot affect clamping, and the protrusion height cannot be greater than 0.8 mm.
It should be noted that the entirety of the pressure sensor 25 defines the pressure sensor 25 inside the jaw base 100 by means of the fixing flange 320 and a plurality of fastening elements (optionally screws); the pressure range of the pressure sensor 25 needs to be larger than the maximum pressure of the experimental positive pressure, and should not be larger than the maximum pressure required by the experiment, so as to avoid affecting the accuracy of the experiment.
It is understood that in other embodiments of the present invention, the pressure sensor 25 may be disposed on the clamping portion 21 by a detachable connection manner (e.g., snap-fit, socket-fit, etc.) instead of being fixedly disposed on the clamping portion 21, or the pressure sensor 25 may be disposed on the jaw moving assembly 23, or other pressure measuring device such as a pressure measuring device may be used instead of the pressure sensor 25 to obtain the positive pressure exerted on the sample 10.
Further, the movable clamping jaw 200 further includes a movable portion 220, and specifically, the movable portion 220 is disposed below the second clamping jaw portion 210. The base 120 is also provided with a stopper 122. The stopper portion 122 cooperates with the movable portion 220 to hold the first and second jaw portions 110, 210 relatively close to or away from each other to apply a positive pressure to the sample 10. In the present embodiment, the movable portion 220 is embedded in the position limiting portion 122 along the first direction. Specifically, the limiting portion 122 is a limiting groove extending along the first direction, and the movable portion 220 is a protruding portion disposed at the bottom of the second clamping jaw portion 210.
As can be seen from fig. 3 and 4, the limiting groove is a dovetail groove, and the movable portion 220 is a dovetail-shaped protrusion. Specifically, in the first direction, the top edge of the dovetail groove is located at the center of the upper surface of the base 120 to form a notch, and the bottom edge of the dovetail groove (the length of the bottom edge is greater than that of the top edge) is located in the base 120 and parallel to the upper surface of the base 120. That is, the longitudinal section of the dovetail groove of the base 120 forms an isosceles trapezoid structure, the slot is the top side of the isosceles trapezoid, and the end far away from the slot is the bottom side of the isosceles trapezoid. The movable portion 220 is a prism having a dovetail-shaped longitudinal section and an isosceles trapezoid, i.e., a dovetail-shaped protrusion. The top edge of the dovetail-like projection is arranged at the bottom of the movable jaw 200, and the bottom edge of the dovetail-like projection extends towards the side away from the movable jaw 200.
In this embodiment, the first sliding plane 121 is formed on the upper surface of the base 120 except for two sides of the notch of the limiting groove. The bottom of the second jaw portion 210 forms a second sliding plane 212 except for both sides connected to the movable portion 220.
It is understood that in other embodiments of the present invention, the movable portion 220 and the limiting portion 122 may also be an i-shaped groove or a guide wheel, as long as the limiting can be achieved.
As can also be seen from fig. 2 to 5, the first clamping jaw portion 110 is in a transition with the base 120 through a chamfer, and one end of the second clamping jaw portion 210 close to the first clamping jaw portion 110 is connected with the movable portion 220 through a chamfer. The structural strength of the structural joint can be increased by providing the chamfer.
And the side of the bottom of the second jaw portion 210 away from the first jaw portion 110 is connected to the movable portion 220 by a transition portion 222. Specifically, in the first direction, the transition portion 222 extends in a direction away from the first jaw portion 110 and gradually increases in thickness; from the direction in which the second jaw portion 210 approaches the movable portion 220, the transition portion 222 extends in a direction away from the movable portion 220 and gradually increases in thickness. This forms an arc-shaped slope at the transition 222 on the side of the bottom of the second jaw portion 210 away from the first jaw portion 110.
Further, in the first direction, the thickness of the movable portion 220 is greater than that of the second jaw portion 210. Thicker movable part 220 provides firm base for movable clamping jaw 200's focus is on the lower side, thereby movable clamping jaw 200 is more stable, so can guarantee the stationarity that movable part 220 moved.
With continued reference to fig. 2-5, it can be seen that jaw moving assembly 23 includes a drive link 310, a fixed flange 320, and a rotating link 330. The transmission rod 310 includes a threaded section 311, a connection section 312, a mating section 313 and an extension section 314 connected in sequence.
Threaded section 311 is connected to the mating section by a connecting section 312, and an extension section 314 is provided at the end of mating section 313 remote from connecting section 312. The threaded section 311 is provided with external threads; a base body 120 on the clamping jaw base 100 is provided with a fixing hole 101, and a movable part 220 of the movable clamping jaw 200 is provided with a transmission threaded hole 201; the matching section 313 is rotatably arranged in the fixing hole 101, and the threaded section 311 is matched with the internal thread in the transmission threaded hole 201 so as to drive the movable clamping jaw 200 to approach or depart from the clamping jaw base 100.
The threaded section 311 is provided with a full trapezoidal thread. The connecting section 312 is a conical surface, and the diameter of the connecting part of the conical surface and the threaded section 311 needs to be smaller than the small diameter of the thread; the matching section 313 is matched with the fixed hole 101 of the transmission rod of the clamping jaw base 100, and the extension section 314 is provided with a threaded through hole; the thread section 311 is slightly smaller than the length of the dovetail groove at the upper part of the base body 120 of the clamping jaw base 100, so that the length of the transmission rod 310 is reduced while the stroke of the movable clamping jaw 200 is ensured.
The fixing flange 320 is disposed at the periphery of the fixing hole 101, and the fixing flange 320 and the fixing hole 101 enclose a space for accommodating the rotation of the fitting section 313. The diameter of the circular hole in the middle of the fixed flange 320 is larger than the diameter of the extension section 314 of the transmission rod 310 and smaller than the diameter of the matching section 313; the fixing flange 320 integrally fixes the fixing flange 320 to the jaw base 100 by a plurality of fastening members (screws in this embodiment).
The rotating rod 330 is disposed in the circumferential direction of the extension 314. The rotating rod 330 is divided into two sections, one section is provided with threads and is matched with the threaded through hole of the extending section 314 of the rotating rod 330; the other section is provided with a knurl, the diameter of the knurl is larger than that of the thread section 311, and the end part is provided with a spherical surface to prevent cutting.
Further, as can be seen from the figure, the colloid shear bonding strength test fixture 20 further comprises a fixture fixing and adjusting part 24; the fixture fixing and adjusting part 24 is movably arranged at the bottom of the clamping part 21, so that the gravity center of the sample 10, the tensile direction of the tensile testing machine and the extending direction of the sample 10 are located on the same plane.
In this embodiment, the fixture fixing and adjusting portion 24 includes a sliding bottom fixture 410 and a locking assembly; the sliding bottom fixture 410 is movably disposed on the jaw base 100, and the locking assembly is connected to the sliding bottom fixture 410 to lock the sliding bottom fixture 410 to the jaw base 100.
Further, the locking assembly includes a sliding rod 420 and a fastener 430; a waist-shaped hole 123 penetrating through the base body 120 is formed below the base body 120 of the clamping jaw base 100, the waist-shaped hole 123 extends along the first direction, and the sliding rod 420 penetrates through the waist-shaped hole 123; the sliding bottom fixture 410 is movably disposed on the jaw base 100 by a sliding rod 420, and a fastener 430 is connected with the sliding rod 420 to lock the sliding bottom fixture 410 on the jaw base 100.
In this embodiment, the sliding bottom fixing part 410 includes an upper sliding part 411 and a lower fixing part 412; the base 120 is provided at the bottom thereof with a sliding groove 124 extending in the first direction, and the upper sliding portion 411 is movably disposed in the sliding groove 124. Specifically, the sliding slot 124 is two dovetail slots each extending along the first direction. The bottoms of the long sides of the dovetail grooves are parallel to the bottom surface of the base body 120 and are positioned in the base body 120, and the short sides of the dovetail grooves form notches in the bottom surface of the base body 120. The waist-shaped holes 123 penetrate through the side walls of the two sliding grooves 124. The surface of the waist-shaped hole is provided with a counter bore groove.
Optionally, the upper sliding part 411 is composed of two dovetail-shaped blocks, and the dovetail-shaped blocks are matched with the lower dovetail groove of the clamping jaw base 100; the dovetail block is provided with a matching through hole 411a along the same axis, and the diameter of the matching through hole 411a is consistent with the width of the waist-shaped hole 123 of the clamping jaw base 100. The lower fixing part 412 is a rectangular plate and can be directly clamped on the lower clamping claw of the tensile testing machine; the lap joint height of the joint of the upper sliding part 411 and the lower fixing part 412 is at least greater than 1/5 of the height of the whole upper sliding part 411, and a large transition connecting part 413 is arranged at the joint to ensure the strength of the joint and avoid the influence of fracture on the experimental result during the experiment.
Optionally, the transition portion 222 gradually decreases in thickness in a direction away from the base 120; the transition portion 222 gradually decreases in thickness in a direction adjacent to the lower fixing portion 412. Thus, an arc inclined surface is formed at the connection between the upper sliding portion 411 and the lower fixing portion 412. The fastener 430 is in threaded connection with the sliding rod 420; the two are fixedly matched for use. Alternatively, the fastener 430 is a nut and the sliding rod 420 is a sliding bolt. The sliding bolt penetrates through the waist-shaped hole 123 of the base body 120 and the matching through hole 411a of the dovetail-shaped block of the sliding bottom fixing 410, after the bolt head is completely sunk into the counter bore groove of the waist-shaped hole 123, the sliding bolt protrudes out of the thread section 311 from the other side, the fastening nut locks the sliding bolt, and a butterfly nut is preferably selected as the fastening nut for operation. The upper sliding part 411 and the lower fixing part 412 are connected by a transition connection part 413 to increase the stability of the connection of the two.
The overall material hardness of the colloid shear bonding strength test tool 20 needs to be more than 70HB, the yield strength needs to be more than 150MPa, and 6061-T6 is preferred.
The embodiment provides a method for testing the shearing and bonding strength of a colloid, which comprises the steps of applying positive pressure to an outer bonding sheet 12, fixing the outer bonding sheet 12, pulling a core bonding sheet 11 to move outwards through a tensile force tester until the core bonding sheet 11 is completely separated from the colloid 13 on any side, and recording the maximum load during shearing as a breaking load;
applying different positive pressures to the same colloid 13 under the condition of the same bonding area to obtain the shearing bonding strength of the colloid 13 under different positive pressures;
respectively testing the shear bonding strength of different colloids 13 under different positive pressures;
and selecting the colloid 13 meeting the shearing preset bonding strength under the preset positive pressure according to the plurality of groups of measurement results.
This provides positive pressure on the bonded sample 10 on the outside to ensure that the gel 13 boundary does not prematurely break away during testing. Meanwhile, positive pressure is applied to the bonding sample 10 on the outer side, and the bonding condition under the actual use scene is simulated along with the change of the positive pressure, so that multiple groups of data are tested, and the corresponding bonding colloid 13 is convenient to select under different actual use conditions. Therefore, the adhesive force of the colloid 13 can be accurately and efficiently measured and the required colloid can be quickly selected.
Further, positive pressures of different magnitudes are applied to the outer-side adhesive sheet 12, and the data of the breaking load under different positive pressures are obtained through respective tests by a tensile testing machine.
Optionally, applying a positive pressure F to the outside of the outside adhesive sheet 12; the positive pressure F is increased progressively from 0kg by a preset pressure value, and at least 10 groups of data are obtained through testing; when the positive pressure is too large, the tensile testing machine cannot pull the test sample 10, and the positive pressure needs to be reduced for retesting.
Further, the moving direction of the core adhesive sheet 11 with respect to the outer adhesive sheet 12 is always parallel to the bonding plane of the glue 13, and no deviation occurs. Thus ensuring the testing effect.
It should be noted that the experimental result uses the formula σcCalculated as P/A, where σcThe bonding shear strength of the bonding plane is expressed in MPa; p is the damage load when the bonding surface is damaged, and the unit is N; a is the sum of the areas of the bonding surfaces and the unit is mm2。
During testing, the core part of the test sample 10 is an experimental bonding sheet, both sides of the core part are coated with the colloid 13, and the outside of the colloid 13 is provided with the bonding sheet again; the whole clamping tool consists of a clamping part 21, a pressure sensor 25, a clamping jaw moving assembly 23 and a tool fixing and adjusting part 24; when in test, positive pressure is applied to the sample 10 through the tool, the clamping part 21 fixes the outer-side test bonding sheet, the core bonding sheet 11 is pulled through the tensile test machine to move outwards until the core bonding sheet 11 is completely separated from the colloid 13 on any side, and the maximum load when in shearing is recorded, namely the breaking load. And then calculating by a formula to obtain the bonding shear strength of the bonding surface. Applying different positive pressures to the same colloid 13 under the condition of the same bonding area to obtain the shearing bonding strengths of the colloid 13 under different positive pressures; then, respectively testing the shearing bonding strength of different colloids 13 under different positive pressures (under the condition of drawing the same bonding area, the curves of the shearing bonding strength of the colloids 13 under different positive pressures can be drawn); according to the plurality of sets of measurement results (the curve relating to the positive pressure and the shear bonding strength of each colloid 13), the colloid 13 meeting the shear preset bonding strength under the preset positive pressure is selected. In summary, the embodiments of the present invention provide a method and a tool for testing a shear bonding strength of a colloid, which have at least the following advantages:
1. a method for testing the shearing and bonding strength of a colloid adopts metal bonded on two sides, and the preparation difficulty of a sample 10 is small.
2. A method for testing the shear bonding strength of a colloid applies positive pressure to a bonded sample 10 on the outer side to ensure that the boundary of the colloid 13 cannot be separated in advance in the testing process.
3. A method for testing the shear bonding strength of a colloid is characterized in that a bonding sample 10 is subjected to positive pressure on the outer side, and the bonding condition under an actual use scene is simulated along with the change of the positive pressure, so that multiple groups of data are tested, and the selection of corresponding bonding colloids 13 under different actual use conditions is facilitated.
4. A clamping tool is provided with a pressure detector, can accurately know the clamping pressure, and is convenient for experimental verification.
5. The utility model provides a clamping frock, has great stroke, can realize the test of great thickness's experimental sample clamping.
6. The utility model provides a clamping frock, bottom fixed part is horizontal adjustable, can guarantee that the sample of different thickness is experimental, and bottom fixed part and sample center are in the coplanar, guarantee the accuracy of experiment.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (11)
1. A method for testing the shearing and bonding strength of a colloid is characterized by comprising the following steps:
applying a positive pressure to the sample, the sample (10) comprising a core wafer (11) and two outer wafers (12); the two outer side bonding sheets (12) are respectively arranged on two sides of the bottom of the core bonding sheet (11); the core bonding sheet (11) and the outer side bonding sheet (12) are bonded and connected through a colloid (13); positive pressure is applied vertically to the outer adhesive sheet (12); fixing the outer side bonding sheets (12), pulling the core bonding sheets (11) to move outwards through a tensile force tester until the core bonding sheets (11) are completely separated from the colloid (13) on any side, recording the maximum load during shearing as a breaking load, and calculating the shearing bonding strength of the colloid (13) according to the breaking load;
applying different positive pressures to the same colloid (13) under the condition of the same bonding area to obtain the shearing bonding strength of the colloid (13) under different positive pressures;
respectively testing the shear bonding strength of different colloids (13) under different positive pressures;
and selecting the colloid (13) meeting the shearing preset bonding strength under the preset positive pressure according to the plurality of groups of measurement results.
2. The method for testing the shear adhesion strength of a colloid according to claim 1, wherein:
the two outer side bonding sheets (12) are respectively and symmetrically arranged at two sides of the core bonding sheet (11) along the thickness direction of the core bonding sheet (11);
and the tops of the outer side bonding sheets (12) are arranged at the bottoms of the core bonding sheets (11) through colloids (13).
3. The method for testing the shear adhesion strength of a colloid according to claim 1, wherein:
applying a positive pressure F to the outside of the outer adhesive sheet (12); the positive pressure F is increased progressively from 0kg by a preset pressure value, and at least 10 groups of data are obtained through testing; when the positive pressure is too large, the tensile testing machine cannot pull the test sample (10), and the positive pressure needs to be reduced for retesting.
4. The method for testing the shear adhesion strength of a colloid according to claim 1, wherein:
the moving direction of the core bonding sheet (11) relative to the outer bonding sheet (12) is always parallel to the bonding plane of the colloid (13), and no offset is generated.
5. The utility model provides a colloid shear bonding strength test fixture which characterized in that includes:
a clamping part (21) and a clamping jaw moving assembly (23);
the clamping part (21) comprises a clamping jaw base (100) and a movable clamping jaw (200), and the clamping jaw base (100) and the movable clamping jaw (200) enclose to form a clamping space for clamping a sample (10);
the jaw moving assembly (23) is provided on the clamping portion (21) so that the movable jaw (200) and the jaw base (100) approach each other in a first direction to apply a positive pressure to the sample (10).
6. The colloid shear bonding strength test tool according to claim 5, characterized in that:
the clamping jaw base (100) comprises a first clamping jaw part (110) and a base body (120), and one side, close to the movable clamping jaw (200), of the first clamping jaw part (110) is provided with a first clamping jaw fixing surface (111);
the movable jaw (200) comprises a second jaw portion (210), the second jaw portion (210) having a second jaw securing face (211) arranged opposite the first jaw securing face (111); the first clamping jaw fixing surface (111) and the second clamping jaw fixing surface (211) enclose to form the clamping space;
the movable clamping jaw (200) is movably arranged on the base body (120) so that the first clamping jaw fixing surface (111) and the second clamping jaw fixing surface (211) are close to each other to apply positive pressure to the test sample (10).
7. The colloid shear bonding strength test tool according to claim 6, characterized in that:
the movable clamping jaw (200) comprises a movable part (220), and the base body (120) comprises a limiting part (122);
the limiting part (122) is matched with the movable part (220) so that the first clamping claw part (110) and the second clamping claw part (210) are kept relatively close to or far away from each other to apply positive pressure to the sample (10).
8. The colloid shear bonding strength test tool according to claim 6, characterized in that:
the clamping jaw moving assembly (23) comprises a transmission rod (310), and the transmission rod (310) comprises a matching section (313) and a thread section (311) provided with an external thread;
a fixing hole (101) is formed in the clamping jaw base (100), and a transmission threaded hole (201) is formed in the movable clamping jaw (200);
the matching section (313) is rotatably arranged in the fixing hole (101), and the thread section (311) is matched with the internal thread in the transmission threaded hole (201) so as to drive the movable clamping jaw (200) to be close to or far away from the clamping jaw base (100).
9. The colloid shear bonding strength test tool according to claim 5, characterized in that:
the colloid shearing and bonding strength testing tool further comprises a tool fixing and adjusting part (24);
the fixture fixing and adjusting portion (24) is movably arranged at the bottom of the clamping portion (21), so that the center of gravity of the sample (10) is located on the same plane with the tensile direction of the tensile testing machine and the extending direction of the sample (10).
10. The colloid shear bonding strength test tool according to claim 9, characterized in that:
the tool fixing and adjusting part (24) comprises a sliding bottom fixing part (410) and a locking assembly;
the sliding bottom fixing body (410) is movably arranged on the clamping jaw base (100), and the locking assembly is connected with the sliding bottom fixing body (410) to lock the sliding bottom fixing body (410) on the clamping jaw base (100).
11. The colloid shear bonding strength test tool according to claim 5, characterized in that:
the colloid shearing and bonding strength testing tool further comprises a pressure sensor (25);
the clamping jaw base (100) is provided with a mounting groove and a wiring harness groove, and the mounting groove is provided with an accommodating through hole facing the movable clamping jaw (200); the pressure sensor (25) is arranged in the mounting groove, a data line of the pressure sensor (25) is arranged in the wiring harness groove, and the accommodating through hole is used for accommodating a detection head of the pressure sensor (25).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210248991.XA CN114459998A (en) | 2022-03-14 | 2022-03-14 | Method and tool for testing shearing bonding strength of colloid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210248991.XA CN114459998A (en) | 2022-03-14 | 2022-03-14 | Method and tool for testing shearing bonding strength of colloid |
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